“He was sophisticated enough to strategize that event to get away with it,” says veteran San Diego prosecutor Wendy Patrick. “To choose a hotel where they knew him, and they didn’t raise an alarm that he brought ten pieces of luggage up to his room.”

Paddock's rampage lasted about nine minutes.

Investigators later began raising questions about timelines involving a security guard and another employee at the Mandalay Bay resort hotel.

“It’s almost as if he was looking for some kind of a source of excitement that he wasn’t getting,” says Patrick. “There’s more to this guy that we yet know. And I’m convinced that we’re eventually going to learn enough to come up with a motive.”